Early warning if ADO extensions aren't installed

[tdashworth]

Is your feature request related to a problem? Please describe.
If the required extensions aren't installed, the generator will attempt to do so. If the user does not have the required permissions, this will fail the entire (sub)generation process.

Describe the solution you'd like
After the ADO details have been entered (org and pac), the existence of extensions can be checked, and if the user doesn't have permissions, notify the user and quit the process.

[tdashworth]

Adding links to the extensions would benefit the user to inform their ADO admin. Maybe even a short pre-written message?